Mr. de Blasio has made few public appearances since Officer Ramos and his partner, Officer Wenjian Liu, were fatally shot in Brooklyn on Dec. 20.

The mayor has avoided unscripted interactions with the news media, taking no questions from reporters since Monday afternoon. On Friday, his aides would not disclose his location until after 9 p.m., moments before he arrived for the final minutes of a wake and memorial service for Officer Ramos.

People close to de Blasio also said he supported the Garner protesters not because he backed their position, but because he wanted to avoid antagonizing them in the wake of the grand jury decision not to indict the officer who killed Garner.

Notoriously late Mayor Bill de Blasio kept more than 100 people waiting at the gate to board a JetBlue flight from JFK Airport to Puerto Rico last month because he was running late and had the plane held for him, DNAinfo New York has learned.

It is unclear why the mayor was late for the plane, but his NYPD security personnel had to radio the airline security to hold it for him, sources said.

For Mayor Bill de Blasio, on a daylong tour of Washington on Wednesday, no topic seemed too big to tackle. “I think,” the mayor mused during a morning appearance here, “the American dream has ceased to function for a lot of families.”

But the mayor on display here on Wednesday looked unruffled by his recent troubles — and undeterred in his efforts to raise his national profile as a lodestar of the left.

Mayor Bill de Blasio turned up 30 minutes late for an NYPD boat waiting to take him from Gracie Mansion to the Rockaways for last week’s solemn ceremony to remember the victims of Flight 587, DNAinfo New York has learned.

“The fog played a minimal, if any, role,” a law enforcement source said.